public class two {
    public static void main(String[] args) {
        S s = new S();
        System.out.println("姓名:" + s.name);
        System.out.println("年龄:" + s.age);
        System.out.println("学号:" + s.No);
    }

}
class S{
    public String name = "zhangsan";
    public String age = "18";
    public String No = "90728";
}